When I was an undergraduate student in Chemistry, I was treated to an unforgettable lecture by Prof. Carl Trindel on symmetry in nature. Vi Hart’s example takes this concept in a mathematical direction with depth, insight and beauty. Enjoy!

Yes, earning a degree from MIT can be costly. Believe it or not, MIT has been offering free course materials for ten years now. If you’re an educator, and you’re not familiar with their extraordinary OpenCourseWare, you’re missing out. One hundred million people so far have learned from this free open source.

Source. A newsworthy study about a genetic signature of centenarians published in Science has not stood up to scrutiny by the blogosphere and peer scientists and has now been formally retracted by the authors.

Source. Disagreements can arouse passions. The blogosphere can be a battlefield, with rapid fire blog posts and comments flying to and fro, sometimes helpful and thoughtful, sometimes off point unbridled ranting.